Analysis on Agriculture Drought Degree in Crop Growing Season in Recent 50 Years in Xinmin in Liaoning

Linear regression,climate trend rate,integral humidity indicators and analysis of wet and dry index were adopted,precipitation and agricultural water demand and dryness degree were systematically analyzed. The results indicated that the precipitation tendency rate of crop growing season in recent 50a was-19.983mm/10a,precipitation trend reduced about 100mm. The precipitation of 6%-7% year was basic satisfaction,and agricultural water demand satisfactory degree reduced 23%. Due to reducing precipitation,climate type changed from sub-humid,partial drought into moderate type. In growing season,mean water shortage 56mm,36% of the year in the drought-threatened; spring drought was the most serious,the probability was 64%; followed by autumn,the probability was 58%; summer minimum,the probability was 24%. The drought probability in May was 70%,which has significant effect on agriculture production.